A Computing Method for Sand Inrush Quantity through a Borehole in Longde Coal Mine

Table 2

Parameters of plane equation.

Parameter	C1-C2	C2-C3	C3-C4	C4-C5	C5-C6	C6-C7	C7-C1
a	0.8750	0.0334	−0.0057	−0.0019	−0.0164	−0.0071	−0.3080
b	1.0000	0.0071	0.0099	0.0081	−0.0167	−0.0017	1.0000
c	2.1501	0.0552	−0.0185	0.0135	−0.0379	0.0118	−2.7304
e	0.0000	1.0000	1.0000	1.0000	1.0000	1.0000	0.0000